I fact checked this and it's indeed something called "Blue Monday," which is a Monday in January, typically the third Monday of the month, that is characterized as the most depressing day of the year. 
So yes, the next week or so might feel a little more BLAH than usual, especially if you live in the Northern Hemisphere, but I'm hoping this episode helps you find tiny moments of magic in the mundane. 
Follow Madison: @madisonciccone
Work with Madison 1 x1: https://stan.store/MadisonCiccone
Madison's Website: https://madisonciccone.com/
Buy the Gratitude Journal on Amazon Prime
Ride with her at SoulCycle in Boston